Cationic triazoleazoindole dyestuffs

ABSTRACT

NEW WATER-SOLUBLE QUATERNIZED CATIONIC MONOAZO DYESTUFFS REPRESENTED BY THE GENERAL FORMUA   2-R1,3-R2,4-R6,5-((1-R4,2-R3,R5-INDOL-3-YL)-2H-1,2,4-   TRIAZOLIUM Z(-)   WHEREIN R1, R2, R3, R5, R6 AND Z$ HAVE THE MEANINGS RESPECTIVELY DEFINED IN THE DESCRIPTION AND CLAIMS. THE NEW CATIONIC MONOAZO DYESTUFFS ARE SUITABLE FOR DYEING VARIOUS FIBROUS MATERIALS SUCH AS MORDANT-TREATED CELLULOSE FIBRES, ACETATE FIBRES, PAPER, SILK, LEATHER, SYNTHETIC FIBRES, ESPECIALLY FIBRES OF POLYACRYLONITRILE, POLYESTERS AND INTERPOLYMERS THEREOF AND THE LIKE. GREENISH YELLOW TO REDDISH YELLOW SHADES OF THE DYEING THUS OBTAINED ARE CHARACTERIZED BY THEIR EXCELLENT FASTNESS TO SUNLIGHT, WASHING, RUBBING AND HEAT AND THEIR ALMOST COMPLETE LACK OF PHOTOTROPISM.

AIQV 1525 m April 4, 1972 MAsAo uzUKA ETAL CATIONIC TRIAZOLEAZOINDOLE DYESTUFFS Filed May 15, 1969 INVENTORS MASA@ HZUKA NORIO IGARI I l Q 8 '5% (l 901 AONVQHOSQV United States Patent O U.S. Cl. 260-157 8 Claims ABSTRACT OF THE DISCLOSURE New water-soluble quaternized cationic monoazo dye- 'stulis represented by the general formula wherein R1, R2, R3, R4, R5, R6 and Z9 have the meanings respectively defined in the description and claims.

The new cationic monoazo dyestuffs are suitable for dyeing various brous materials 'such as mordant-treated cellulose libres, acetate fibres, paper, silk, leather, synthetic iibres, especially libres of polyacrylonitrile, polyesters and interpolyrners thereof and the like. Greenish yellow to reddish yellow shades of the dyeings thu's obtained are characterized by their excellent fastness to sunlight, washing, rubbing and heat and their almost complete lack of phototropism.

This invention relates to novel cationic azo dyestuifs and more particularly relates to novel quaternized cationic monoazo dyestuffs capable of dyeing various fibrous materials of natural and artificial sources in full and brilliant greenish to reddish yellow shades. The dyeings thus obtained are characterized by their excellent fastness properties.

The novel cationic monoazo dyestuffs of the present invention are represented by the general formula wherein R1 is a member selected from the group consisting of alkyl containing up to 4 carbon atoms, benzyl and phenyl; R2 and R4 are each a member selected from the group consisting of hydrogen, alkyl containing up to 4 carbon atoms, benzyl and phenyl; R3 is a member selected from the group consisting of alkyl containing up to 4 carbon atoms, phenyl and p-tolyl; R5 is a member selected from the group consisting of hydrogen, chlorine, methyl 3,654,259 Patented Apr. 4, 1972 and methoxy; R6 is a member 'selected from the group consisting of methyl, ethyl, benzyl, carbamoyl-ethyl, the N-atom of which is either unsubstituted or substituted with ethyl, methoxyethyl and acetylethyl; and Z is an anion.

The above-defined cationic monoazo dyestuis of the present invention may advantageously be prepared by quaternizing a monoazo dyestuff free from sulfonic and carboxylic radicals and represented by the formula wherein R1, R2, R3, R4 and R5 are as defined above, with a quaternizing agent according to conventional procedures. There are thu's obtained novel, water-soluble basic monoazo dyestuiis having excellent characteristics with respect to the shades of dyeings and dyeing properties.

The quaternary ammonium monoazo dyestuffs of the present invention, as will be explained later in detail, are new triazol compounds having definite chemical structures wholly different from those of hitherto known basic monoazo dye'stulis derived from aminotriazol compounds.

It is surprising and wholly unexpected that particular triazol monoazo dyestufs of the above-mentioned general Formula 2 used as the starting material for the quaternization according to the present invention can be prepared by diazotizing an aminotriazol compound which contains a substituent at a nitrogen atom of said triazol ring, and then coupling the resulting diazotized aminotriazol compound with an azo component capable of imparting an indol residue to the resulting triazol monoazo dyestuff of the "Formula 2. Said triazol monoazo dyestulis possess a denite chemical structure leading to formation of the quaternized ammonium compound having peculiar dyeing properties which are distinguished from those of known quaternized triazol-type basic monoazo dyestuils.

Hitherto known quaternized triazol-type basic monoazo dyestuis derived from known triazol azo compounds are disclosed in the specifications of British Patent Nos. 791,932, 837,471 and 938,814, for example. Among the known triazol-type monoazo dye'stutis, those prepared by coupling the diazotized amino triazol compound with an indol compound as azo component are mentioned in said British Patent No. 938,814. All these known triazol-type monazo dyestuis had been prepared from unsubstituted 3-amino-1,2,4-triazo1 or -substituted 3-amino-1,2,4tri azol as diazo component. There is, however, not particularly described in the British patent specifications with respect to the use of the triazol amino compound containing a substituent at nitrogen atom of the triazol ring as diazo component. -It is therefore uncertain which position of the triazol ring is actually substituted with an alkyl radical when the resultant triazol monoazo dyestul is further quaternized with, for example, an alkylating agent.

On account of its characteristic chemical structure, it is surmised that the known triazol derivative may belong to anyone of the three probable tautomers (a), (b) and (c) in Group A of the schematic formulation :given in the following table.

are shown in the following Table II. Each of these intermediate monoazo dyestulfs was chromatographically identied as a simple substance.

TABLE II 6 cording to the present invention on polyacrylonitrile libres is also distinguished from that of the known one. These facts hint that there is a distinct ditference be- Intermediate monoazo dyestul used in the Intermediate monoazo dyestufl (I) used in the present invention known process Imax. in pyridlne=383 mi;

In the accompanying drawing (FIG. 1), the absorption spectra in visible region of the intermediate monoazo dyestuffs and of the quaternary ammonium salts thereof according to the present invention are graphically shown in comparison with the absorption spectra of the corresponding intermediate monoazo dyestuis and the quaternary ammonium salts thereof obtained by the known processes.

As is seen from the above Table II and the curves in FIG. l, the maximum absorption in the spectra of the compound (l) used in the quaternization according to the present invention, diierent from that of the cornpound (II) used in the quaternization according to the known processes, shifts toward the region of the shorter wave lengths than that of the known compound (II). The fact hints that the chemical structure of the former compound diifers from that of the latter. And, it is sure that the former compound must have the structure falling in with the Formula e of Group B in Table I, while the latter compound must have the structure falling in with either one of the Formulae d and f.

Similarly, the absorption spectra in visible region of a quaternary ammonium compound (III) obtained from the above intermediate triazol monoazo dyestutf (I) according to the present invention and of the corresponding known ammonium compound (IV) obtained from the above compound (II) according to the known processes are shown in the following Table III and in FIG. 1. These quaternary ammonium compounds were also chromatographically identified as simple substance.

yHere again, it is noted from Table III and FIG. 1 that the maximum absorption wave length in the spectra of the quaternary ammonium compound of the present invention, like those of the compound (I) in Table II and in FIG. 1, shifts toward the region of the shorter wave lengths than the maximum absorption wave length of the corresponding quaternary salt (IV) of the known azo dyestuff. The shade of the quaternized dyestuff ac- Benzylation product (Il) ot am. in pyridine=396 mn tween the chemical structures of these two dyestutfs. It is thus believed that the dyestutfs according to the present invention should have the chemical structure corresponding to the Formula i or j of the Group C in Table I, whereas the known dyestuffs should have the' chemical structure corresponding to anyone of the Formulae g, h, k and l.

Incidentally, it has been observed that azo dyestuifs obtained from 2benzyl3amino1,2,4-triazol hydrochloride melting at 241 C. which was prepared according to the article of Shirakawa, the Journal of Japanese Pharmacological Society, 80, pp. 1,550-6 (1960), unexceptionally show the same absorption spectra as those of the known azo dyestuffs. It is therefore surmised that the known intermediate monoazo dyestutf should have the Formula d of Group B in Table I, and furthermore the quaternary ammonium compound derived therefrom should naturally have either the Formula g or h. It may be concluded, taking into consideration the eifect of the steric hindrance of the compounds of Group B upon a quaternizing agent that there is a probability that the compound (d) will result in the compound (h) according to the known process, While the compound (e) will result in the compound (j) according to the present invention.

The above presumption is reasonably supported by the chemical formula of the analogous compounds given in the specifications of British Patent Nos. 837,471 and 938,814, for example.

At any rate, it is obvious from the above considerations that the triazol monoazo dyestuifs in the form of quaternary ammonium salts of the present invention are new substances that are wholly distinguished from those disclosed in British Patent No. 938,814.

The intermediate triazol monoazo dyestuffs represented by the aforementioned Formula 2 which serve-as starting materials for the production of the quaternzed monoazo dyestus according to the present invention may be obtained by coupling diazotized 3-amino-1-substituted (or 1,5-disubstituted) 1,2,4-triazol in an aqueous medium with an indol derivative.

As the substitutent R1 at the nitrogen atom of the aforementioned a-minotriazol compound used as a diazo component for the production of the intermediate monoazo dyestuffs, there is mentioned,for example, lower alkyl such as methyl, ethyl and butyl radicals; aralkyl such as benzyl; and aryl such yas phenyl radical; whereas the substituent R2 at the carbon atom of the said triazol compound, there may be mentioned a hydrogen atom, lower alkyl such as methyl, ethyl and butyl radicals; aralkyl such as benzyl radical; and aryl such as phenyl radical.

The following triazol compounds, for example, may preferably be exemplified therefor:

and the like.

As the substituent in the indol moiety of the coupling component that corresponds to R3 in the Formula 2, there is mentioned, for example, lower alkyl such as methyl, ethyl and butyl radicals; and aryl such as phenyl p-tolyl and naphthyl radicals, and as the substituent corresponding to R4, there is mentioned a hydrogen atom, lower alkyl such as methyl, ethyl and butyl radicals; aralkyl such as benzyl radical, aryl such as phenyl radical, and as the substituent corresponding to R5, there is mentioned a hydrogen or chlorine atom, a nonionic substituent such as lower alkoxy lower alkyl and the like radicals.

The following indol derivatives, for example, may be exemplified as preferable: 2methylindol, 1,2-dimethylindol, l-methyl-Z-phenylindol, l-methyl-Z-(4methylphen yl)indol, 1,2-dimethyl-S-chloroindol, 1,2,5-trimethylindol, 1ethyl2phenylindol, 1-ethyl-2-phenyl-5-chloroindol, 1- ethyl-Z-phenyl-S-methoxyindol, 2-phenylindol, 1,2-diphenylindol, 2phenyl5chloroindol and the like.

The novel cationic monoazo dyestuffs of the present invention may be prepared by quaternizing monoazo dyestuffs represented by the afore-mentioned general Formula 2 in accordance with the following two procedures.

In the first procedure a monoazo dyestuff is reacted with an alkylating or aralkylating agent in an inert organic solvent such as benzene, toluene, xylene, chloroform, carbon tetrachloride, tetrachloroethane, chlorobenzene, o-dichlorobenzene, nitrobenzene, dioxane and dimethyl formamide. Instead of the inert organic solvent, there may be used an excess amount of the alkylating or aralkylating agent. As preferable alkylating or aralkylating or aralkylating agent, there may be mentioned esters of inorganic acid and organic sulfonic acids and alkyl halides. The following are the typical examples of such agents:

Dimethyl sulfate, diethyl sulfate, methyl ester of benzene sulfonic acid; methyl, ethyl and butyl esters of ptoluene sulfonic acid; methyl chloride, methyl bromide, ethyl iodide, ethyl bromide, benzyl chloride and the like.

Although the above-mentioned quaternizing reaction is exothermic, an external heating is required in most cases in order to initiate the reaction. The reaction is advantageously carried out at an elevated temperature.

In the second procedure of the quatemization, an addition of alpha, beta-unsaturated compound to the intermediate monoazo dyestuff molecule is carried out in a suitable solvent containing a proton-yielding substance. Solvents such as ethanol, dimethyl formamide and, in particular, formic and acetic acids may be mentioned as suitable, because these substances are capable of highly dissolving the intermediate monoazo dyestuffs. As protonyielding substances, there may be employed not only inorganic acids such as hydrochloric, sulfuric and hydrobromic acids and the like, but also oragnic acids such as glacial acetic acid, benzene and toluene sulfonic acids and the like.

As alpha, beta-unsaturated compound, there may be mentioned acrylamide, acryl N-alkylamide, methacrylamide, vinyl ketone, vinyl ether and the like, and acrylic 8 amide is particularly preferable. Although the reaction is exothermic, it is desirable to heat the reaction system in order initiate the reaction.

The resulting quatemary monoazo dyestufls, if they are insoluble in the employed inert solvents, Will settle out. They are recovered easily by filtration. Alternatively, the solvent may be removed from the reaction mixture by vacuum distillation or steam distillation. When a solvent is employed which is miscible with water, the resulting dyestuff in the form of quaternary ammonium salt may be separated by salting out from its aqueous solution.

The quaternized cationic monoazo dyestuffs according to the present invention contain in their molecule an anion derived from, for example, hydrochloric, hydrobromic, sulfuric, benzene and toluene sulfonic acids as well as monoalkyl esters of sulfuric acid. Owing to their strongly basic nature, the colored cationic moiety of the quaternized monoazo dyestuf molecule of the present invention forms a stable salt with anion derived from a relatively weak organic acid such as formic, acetic and oxalic acids. In certain cases, hydroxy ion is also embraced in these salt-forming anions. The dyestutf salts also form a double salt with zinc chloride.

The novel quaternized ammonium monoazo dyestuffs of the present invention, in view of their chemical structure, belong to a class of basic dyestuffs of yellow color and exhibit a good solubility in water. They accordingly are adapted for dyeing papers, cellulose fibres pre-treated with a mordant such as tartar emetic and tannin; acetate fibres, silk, polyacrylonitrile, polyesters and their copolymers. Particularly, the quaternized ammonium monoazo dyestulfs of the present invention exhibit excellent dyeing properties on the fibres of polyacrylonitrile and copolymer of acrylonitrile.

In most cases, the dyeings thus obtained are highly brilliant in shades and are charactreized by a variety of the shades ranging from greenish yellow to reddish yellow. This is highly apprecaited, because there is a difficulty in production of dyestubs capable of producing such geenish yellow shades of the dyeings according to the known processes. The dyeings also show excellent fastnesses to light, washing, rubbing, heat and the like.

The different afiinities of the dyestufs of the present invention on these fibrous materials afford a variety of satisfactorily controlled dyeings ranging from dyeings of deep color to level dyeings of light color.

The following examples illustrate the invention but should not be construed as limiting the invention. In the examples, part and percent are by weight unless otherwise indicated.

EXAMPLE 1 17.4 parts of l-benzyl-3-amino-1,2,4-triazol were dissolved in parts of 60% acetic acid. To the solution were added 10 parts of 98% sulfuric acid, and the whole was cooled to -20 C. At that temperature, 149 parts of nitrosylsulfuric acid derived from 7.3 parts of sodium nitrite were added drop by drop. The reaction mixture was diazotized for one hour while an excess of nitrous acid was held in the solution. After completion of the diazotization, a small amount of urea was added to the reaction mixture to decompose the remaining nitrous acid.

A solution prepared by dissolving 21.8 parts of l-methyl-Z-phenylindol in 218 parts of glacial acetic acid was poured into above diazotized solution While keeping a temperature below 5 C., and the whole was stirred for one hour.

117 parts of ammonium acetate were then added in the course of an hour, and stirring was continued for half an hour to complete the coupling. After completion of the coupling, the whole was poured into 2,000 parts of icewater. Yellow precipitate separated out and was recovered by filtration, washed with water and dried at 70 C.

There was thus obtained a monoazo dyestuff having the formula.

monoazo dyestul, which was soluble in water to yield a yellow aqueous solution. From a weak acid dyebath of the dyestulf acrylonitrile libres were dyed in a brilliant yellow N shade having excellent fastness properties to light, CH2-N C N N C 5 washing, rubbing and heat.

H An ethyl-quaternized monoazo dyestulf was obtained N by the same procedure as that described in this example Q \N except that a corresponding amount of diethyl sulfate or H3 ethyl ester of p-toluene sulfonic acid was substituted for 10 the dimethyl sulfate. By using zinc chloride in addition to 39.2 parts of this dyestulf were dissolved in 320 parts sodium chloride for |salting out of the quaternized monoof dmethylformamide. To the solution were added drop azo dyestul, there was obtained a complex salt of zinc by drop 25.2 parts of dimethyl sulfate at a temperature chloride. of 90-95 C. The mixture was agitated at that tempera- Other quaternized monoazo dyestuffs having similar ture for an additional two hours to complete the quater- 15 dyeing properties were obtained by repeating the same nization.` Then the mixture was poured into 3,000 parts procedures starting from the intermediate monoazo dyeof Water followed by adding 500 parts of sodium chloride stus listed in the following Table IV. In table, the at 80 C. The yellow precipitate separated out was reshade was that of the dyeings on acrylonitrile tibres covered by filtration and dried at 70 C. There were obwith the resulting quatemary ammonium salts of the tained 38.4 parts of a quaternary ammonium salt of the 20 monoazo dyestutfs.

TABLE IV (Parts) Example Monoazo dyestut Solvent Quaternarlzing agent Shade 2 N Dimethylformamid (320) Dimethylsulfate (25.2) Yellow.

mc-N/ mi) C-N=N-C- 3 N ...-.do diethyl sulfate (31.8) Do.

Hgc-N/ o-N=NC n 4 N Dloxan (320) dlmethylsulfate (25.2).... Reddlsh H Cz N/ Yellow.

5 o-N=N-c c1 5 N Dimethylformamlde (300). Methyl p-toluenesulfonate Yellow.

H C N/ (37.2):

r o-N=N-o- H3C N (IJHI 6 Dlmethyltormamlde (320). Dimethyl sulfate (25,-2).... De.-

\ CN=No CH.

TABLE Bfr-Continued (Parts) Example Monoazo dyestui Bolvent Quateruarizing agent Shade 14 Q /N Dimethynormamideoo). D1methy1su1fate(25.2).... Yellow.

N C-N=N-c Q \N i EXAMPLE 15 33.0 parts of the above monoazo dyestuif were dis- 18.6 parts of l-benzyl-S-methyl-3-amino-1,2,4-triazol were dissolved in 130 parts of 80% acetic acid, and 10 parts of 98% sulfuric acid were added. The whole was cooled to a temperature of `-20 C. At this temperature, 149 parts of nitrosylsulfuric acid prepared with 7.3 parts of sodium nitrite were added drop by drop. By maintaining an excess of nitrous acid in the solution for one hour, the diazotization was performed. The remaining nitrous acid was decomposed by adding a small quantity of urea.

A solution was separately prepared by dissolving 13.7 parts of Z-methylindol in 137 parts of glacial acetic acid and was cooled below 5 C. which was then poured into the above diazotization mixture. After agitating the mixture for an hour, there was added 117 parts of ammonium acetate during one hour and agitation was further continued for half an hour to ensure the coupling. After completion of the coupling, the liquor was poured into 2,000 parts of ice-water. The yellow precipitate was recovered by filtration and washed with water. Upon drying at 70 C. the product, a monoazo dyestui having the following chemical formula was obtained.

solved in 200 parts of glyacial acetic acid. To the solution were added dropwise at a temperature of 9095 C. 10.6 parts of 36% hydrochloric acid followed by adding 71.1 part of acrylamide. At that temperature, the whole was stirred for 4 hours to complete the quaternization. The reaction mixture was introduced to 1,500 parts of water, stirred with a small quantity of active carbon and ltered. To the filtrate were added 15.2 parts of zinc chloride and 200parts of sodium chloride to salting out the product. The yellow precipitate separated out was liltered and dried at C.

'I'here were thus obtained 36.8 parts of a double salt of the quaternized ammonium compound of the dyestuif with zinc'chloride.

The double salt of the quaternary amomnium compound is soluble in water yielding a yellow solution. On polyacrylonitrile iibres -a dyeing of brilliant greenish yellow shade was obtained from a weak acid dyebath. The dyeing possessed excellent fastness properties to light, washing, rubbing and heat.

A series of further quaternized monoazo dyestuifs having similar dyeng propertes were obtaned by carrying out the procedures similar to that above mentioned, starting from the intermediate monoazo dyestuis listed in /N Table V below, wherein the shade was that of the dye- CHr \C N N C ings on polyacrylonitrile iibres. H3C- bN/ H3C- 45 \N E TABLE V (Parts) Example Monoazo dyestul Solvent Quaternarlzlng agent Shade 16 C Glacial acetic acid (200).-. Acrylic amide (71.1). Ye11ow.

H C N/ gcochloric acid HCI: CN=NC sN/ il 17 /N ...-.do ..do. Do.-

HIC-N \c-N-NC y TABLE V-lConitinued (Parts) Example Mcnoazo dyestuff Solvent Quaternarizing agent Shade 18 N Glacial acetic acid (200).. Acrylic amide (71.1). Greenish H C N/ Hydrobromic acid yellow.

l CN=NC HC\ N H3CC\ 19 Y N do Acryrlic1 amide u$11.111). Yellow.

po uene s o c nav-N acid (18.0).

H O-N=NC 20 N do Vinyl methyl ketone Do.

(712511)(1 drochloric -H C-N ac Q l c-N=Nc o1 \N/ H C i CH:

21 do Acryl-N-ethylamide Do.

(99.1). Hydrochloric N acid (10.6). -N H C-N=N-C jl 22 Formic acid (200) Vinyl methyl ether (58.1). Reddish Hydrochloric acid yellow. N 0.6). -N H C-N=N-C N CH: E

23 Glacial acetic acid (200).-. Acrylic amide (71.1). Yellow.

' Hydrochloric acid /N\ (10.6). H C-N n C--N=NC- HaC- ll do Acrylic amide (71.1). Do. 24 p-Toluene sulionic acid N (18.1). Hic-N TABLE 'v -Continued (Parts) Example Monoazo dyestul Solvent Quaternarizing agent Shade 25 Glacial acetic acid (200).... Acrylic amide (71.1). Yellow.

p-toluene sulfonic N @-HgC-N/ acid (18.1).

/C-N=N-C- N H C- Q EXAMPLE 26 parts by volume of chloroform and 25.2 p-arts of dimethyl 39.2 parts of the same intermediate monoazo dyestuif as that employed in Example l were heated with a solution of 32.7 parts of ethyl bromide in 200 parts of ethyl alcohol under pressure to a temperature of l120 C. for hours. Most of the solvent was then distilled ofr' under reduced pressure. The residue was recrystallized from water to obtain 39.0 parts of the resulting Iquaternary ammonium salt of the monoazo dyestui.

The dyestui salt thus obtained was soluble in water yielding a yellow solution.

A brilliant yellow dyeing on polyacrylonitrile fibres from a weak acid ldyebath showed good fastness properties to light, washing, rubbing and heat.

By using an equivalent amount of each of methyl bromide, methyl iodide and benzyl chloride for the ethyl bromide in this example, the corresponding quaternary ammonium salts of the dyestuff having similar dyeing properties were obtained.

EXAMPLE 27 To 33.0 parts of the same intermediate `rnonoazo dyestuff as that employed in Example were added 400 sulfate. The whole was refluxed with stirring for 5 hours to complete quaternization. The reaction mixture was subjected to distillation in order to remove most of the chloro form. The residue was dissolved with heating in -a mixture of 12 parts of 36% hydrochloric acid and 1,500 parts of water, shaken with a small quantity of active carbon and liltered while hot. 200 parts of sodium chloride were added to the iiltrate to salt out a yellow precipitate, which was recovered by filtration and dried at C. There were thus obtained 34.3 parts of the quaternary ammonium salt of the dyestuif, which was soluble in water to give a yellow solution.

From a weak acid dyebath of said dyestuif salt, polyacrylonitrile libres were dyed in a brilliant yellow shade having excellent fastness properties to light, washing, rubbing and heat.

A series of the quaternary ammonium salts of the monoazo dyestuifs having properties similar to those above mentioned were obtained by carrying out the same procedure as that described in the above example, starting from .the intermediate monoazo dyestus listed in the following table. In table, shade was that of the dyeings on polyacrylonitrile fibres.

TABLE VI (Parts) Example Monoazo dyestut Solvent Quaternarizing agent Shade 28 /N Chloroiorm (400) Dimethyl sulfate (25.2). Yellow.

H5024? \C N-N C C I N C\ N Ha 29 /N\ Benzene (400) Diethyl sulfate (31.8) Do.

HC N

5 r1; o-N=Nc 00H.

30 /N Dichlorobenzene(400) Etlvlzp-toluene sulfonate Do.

@mC-1T \o N-N c C1 l \N/ (il l i 02H5 TABLE VIA-Continued (Parts) Example Monoazo dyestul Solvent Quaternarizing agent Shade 31 Carbon tetrachloride Diethyl sulfate (25.2) Yellow.

/N (400). E \CN=NC- (N/ 32 N Benzene (400) Dimethyl sulfate (25.2). Do.

C-N=NC- H3C-C u 33 N Chlorobenzene (400) .do Do.

@AmC- \/o-N=Nc s H N H3CC\ N (BH.

34 do .do Do.

The triazol amino compounds in the above examples employed as dazo component for the production of the intermediate monoazo dyestuffs to be subjected to quaternization according to the present invention are prepared by the following referential examples.

Referential Example A.-Preparation of 1benzyl 3amino1,2,4triazol 40 parts of lbenzylaminoguanidine hydrochloride melting at 146147 C. were added to 60 parts of 80% formic acid. 'Ihe mixture was stirred under reux at 103 C. for one hour. The unreacted formic acid was olf under reduced pressure. White crystalline mass separated out was dissolved in 40 parts of Water, and the solution was made alkaline by adding a suicient amount of a 45% aqueous sodium hydroxide solution.

The white crystalline substance separated out was recovered by ltration and recrystallized from 160 parts of water. 28.2 parts of 1-benzyl-3-amino-1,2,4-triazo1 having a melting point of 133 134 C. were thus obtained.

Other corresponding triazol compounds given in the following Table VII were obtained by repeating the reaction procedure of the above referential Example A starting from the substituted aminoguanidines and organic then removed from the reaction mixture by distilling 60 acids.

TABLE VII (Parts) substituted aminoguauidine Benzoyl chloride Triazol amine (yield) NH HCOOH (4.6) CH3NHNHC\ .HC1 HaC-N C--NH2 NH2 H-C=N fNH HCOOH (4.6) N CiH5NHNHC\ .HCl HsCz-N C-NHz NH, H-C=N TABLE VII-Continued (Parts) Substituted aminoguauidine Benzoyl chloride Triazol amine (yield) NH HCooH (4.a) -'NHNHC\ .HC1 /N NH: N C-NH: (18.6) H=N/ (14.4) NH cmCOoH /N\ CHNHNHC .HC1 H3C-N C-NH:

\NH| (13.6) CH1-(|)=N (16.7) NH @fonicoon @Cummins .HC1 l N \NH3 (13.6) C Hg-N/ (20.0) l C-NHg OcHi-C=N parts of 1benzy1aminoguanidine hydrochloride hav. ing a melting point of 146-147 C. were dissolved in substituted aminoguanidiue CHaNHNHC -HCl /NH NHNHC a mixture of 6 parts of glacial acetic acid and 10 parts of acetic anhydride with stirring at 7 080 C. Acetylation was then carried out at 80-90 C. for 2.5 hours. 65 Upon cooling to a room temperature, parts of water were l'added to the reaction mixture, followed by adding 25 parts of a 48% aqueous sodium hydroxide solution with stirring at -60 C. A ring closure reaction was carried out at' a temperature of from 95 C. to 100 C. 70 for one hour while maintaining the alkalinity of the mixture. The reaction mixture was cooled to a room temperature, and the white crystals separated out were recovered by 4iiltration, washed with water and dried at 18.1 parts of 1-benzyl-S-methyl-3-amino-1,2,4-triazol having a melting point of l69170 C. were thus obtained.

In the similar manner, the following triazolamines were also obtained.

TABLE VIII (Parts) Organic acid and acid anhydride COOH (6). (CHC O)2O Triazolamino compound (yield) HaC-C=N CHaCOOH (6). (CHsCOhO 20 parts of l-benzylaminoguanidine hydrochloride melting at 146-147 C. were added with stirring to 40 parts of chlorobenzene at a room temperature, followed by addition of 14 parts of benzoyl chloride. The whole was heated to -120 C. until an evolution of hydrogen chloride ceased. 200 parts of water were added to the reaction mixture and chlorobenzene was removed from the mixture by steam distillation.

8.3 parts of a 48% aqueous sodium hydroxide solution at 60-70 C. were added to the mixture in order to bring the pH value of 12-14, and the whole was heated to boil with stirring for 2 hours. Upon cooling to a room 3. Basic monoazo dyestut Iof the formula temperature, a white crystalline mass separated out from i Y v G3 the mixture which was recovered by filtration, washed ),-GHz-N with water and dried. There were thus obtained 23.4 parts 5 H C Cl, C-N=NC of l-benzyl-S-phenyl-B-amino-1,2,4-triazo1 having a melt- 3 C19 ing point of .14 14l C. N \N/ In the similar manner, there were obtained triazol- (11H3 amines given in the following table. CH:

TABLE IX (Parts) v substituted aminoguanidine Benzoyl chloride Triazol amine (yield) /NH COCi HCiNHNHC/ .HC1 Hmz- C4NH,

/NH C001 N -NHNHc .Hoi @-ilq/ \o-NH1 Y NH: ([}=N/ What we claim is: 4. Basic monoazo dyestuif of the formula 1. Basic monoazo dyestut of the formula: 3f

/N S o N l e; Rl- \c N-N C CHZI/ N Vc \N RS lL R z \N I cie \N/ \N/ Rl H3 l Ri CH. wherein R1 is a member selected from the group consisting of alkyl containing up to 4 carbons, benzyl and phenyl; 5. Basic monoazo dyestlu of the formula R2 and R4 are each a member selected from the group consisting of hydrogen, alkyl containing up to 4 carbons, 45 N 6B benzyl and phenyl; R3 is a member selected from the group consisting of alkyl containing up to 4 carbons, phen- CHVI? C N=N C yl and p-tolyl; R5 is -a member selected from the group C L C19 consisting of hydrogen, chlorine, methyl and methoxy; \N H3C- R5 is a member selected from the group consisting of 50 I \N/ methyl, ethyl, benzyl, carbamoyl-ethyl, the N-atom 0f CH3 H3 which is either unsubstituted or substituted with ethyl, methoxyethyl, and acetylethyl; and Z is an anion.

2. Basic monoazo dyestuif of the formula 6' Basle monoazo dyestu of the formula N CHVN/ N y CN=NC h Y e il; R Z9 CHVN C-N=Nc R2 IIJ cie Ra R3 I? 60 Q/ N H3C-C R N 4 HZCHZCONHQ H wherein R2 and R4 are each a member selected from the group consisting of alkyl containing up to 4 carbons, benzyl, and phenyl; R2 and R4 are each a member selected 65 7 Basic monoazo dyestuff of the ,formula from the group consisting of hydrogen, alkyl containing up to 4 carbons, benzyl and phenyl; R3 is a member selected from the group consisting of alkyl containing up l to 4 carbons, phenyl and p-tolyl; R5 is a member selected /N from the group consisting of hydrogen, chlorine, methyl t .(3H, N and methoxy; R6 is a member selected from the group CN=Nr0 e consisting of methyl, ethyl, benzyl, carbomoyl-ethyhthe N-atom of which is either unsubstituted or substituted with ethyl, methoxyethyl and acetylethyl; and Z isan anion.

25 26 8. Basic monoazo dyestuf of the formula References Cited N e UNITED STATES PATENTS 3,078,137 2/1963 Baumann et al 260--157 X CH2-N \C N=Nc 3,148,935 9/1964 Pfitzner et al 26o-157 X H3C- C1@ 5 3,255,173 6/1966 nennen et a1. 26o- 157 X l FLOYD D. HIGEL, Primary Examiner HzcHzo-NTHZ U.S. C1. X.R. 

